I used something similar called SureSeal when I was in-centre for over 2 years, until I started training for home hemo. It’s a “compression dressing”, which expands to seal the needle hole better.
SureSeal:
http://www.cenmed.com/productDetail.asp?productid=16046&catID=&category=790&mainCat=CSC&cat=
TipStop:
http://www.usa-gambro.com/upload/TipStop%20Spec%20Sheet.pdf
The nurses who trained me don’t use them for home hemo because it’s hard to put them on right when you’re doing it yourself with one hand. I guess where there’s a will, there’s a way, but I find it easier to just use gauze and tape.
Pierre